Since you're looking for a post about Piano and Keyboard All-in-One For Dummies , here are a few options tailored for different audiences.
Piano & Keyboard All-in-One For Dummies is a comprehensive guide that bundles content from several standalone "For Dummies" titles, including Piano For Dummies Keyboard For Dummies Music Theory For Dummies Piano Exercises For Dummies Piano and Keyboard All-in-One For Dummies-PDF-R...
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Piano For Dummies: The basics of posture, hand positioning, and finding your way around the keys. Since you're looking for a post about Piano
The "Rusty" Player: If you took lessons as a child and want to get back into the groove, the refresher sections on reading music are invaluable. Piano and Keyboard All-in-One For Dummies-PDF-R...